KR20110093851A - Vent plug - Google Patents

Abstract

An object of the present invention is to provide a ventilation stopper in which liquid is hard to stay inside while preventing the breakage of the ventilation membrane by the convex portion of the tubular member. The ventilation plug of the present invention is a ventilation plug including a tubular member 1 having a through hole 1a and a ventilation membrane 2 adhered to the tubular member 1, wherein the ventilation membrane 2 is a tubular member ( The convex part 1b which has the welding area | region which contact | connects 1) and the ventilation area | region facing the through-hole 1a, and protruded rather than the plane containing a ventilation area | region is formed in the tubular member 1, and the ventilation film | membrane 2 Has a shape along part or all of the convex portion 1b in the welding region.

Description

Aeration plug {VENT PLUG}

The present invention relates to a ventilation stopper having a ventilation membrane having a function of blocking a liquid such as water droplets or oil droplets while allowing gas to pass therethrough.

Electric devices such as head lamps, rear lamps, fog lights, power windows, pressure sensors, pressure switches, and engine control units of automobiles are used in an environment exposed to liquids such as water, oil, and surfactants. In addition, some general household appliances are used in an environment exposed to liquids such as water, oil, and surfactants, such as electric razors, mobile phones, and electric toothbrushes. In these electrical devices, it is necessary to increase the spinning property of the case storing the electronic components therein, but if it is in a completely sealed state, when the gas inside the case expands and contracts due to temperature change, A pressure difference occurs inside and outside the case, and an excessive load is applied to the case. Therefore, the case needs to keep the gas in and out while preventing liquid from invading.

PTL 1 consists of a cylindrical cover part having a bottom, and a cylindrical body fitted therein, between the inner circumference of the cover part and the outer circumference of the cylindrical body, the bottom surface of the cover part and the bottom of the cylindrical body; The ventilation cap which exhibits waterproofness and air permeability by forming a maze-type ventilation path between is described.

Patent Document 2 describes a ventable stopper attached to an electric motor case of a power window for an automobile. In the sheet joint portion of the cylindrical plug body, a ventilation sheet is formed to block the inside of the plug body, thereby preventing water from entering the inside of the motor case, and also allowing air to flow between the inside and the outside of the case by the function of the ventilation membrane. I'm doing it. In Patent Literature 2, a stopper main body is formed outside the stopper, and the stopper main body is formed so as to protrude upward from the plane including the air permeable membrane. As the protruding portion becomes a protective dam, it is less likely to touch the ventilation membrane directly, contributing to the prevention of breakage of the ventilation membrane.

Patent Document 1: Japanese Patent Laid-Open No. 2001-143524 (Fig. 1) Patent Document 2: Japanese Patent Laid-Open No. 2003-63549 (Fig. 1, Fig. 2)

As mentioned above, the protrusion part of the stopper main-body part of patent document 2 shows a fixed effect in preventing breakage of a ventilation membrane. However, the presence of this protruding portion makes it difficult for liquids such as water and oil to be discharged to the outside of the plug, and since the ventilation membrane is covered with liquid, the effective opening area of the ventilation zone is reduced, and the ventilation performance of the ventilation membrane is reduced. Throw it away.

In view of such circumstances, an object of the present invention is to provide a ventilation stopper in which liquid is hard to stay inside while preventing the breakage of the ventilation membrane by the protrusion (projection) of the plug body.

The ventilation plug according to the present invention, which can achieve the above object, includes a tubular member having a through hole and a vent film adhered to the tubular member, and the vent film includes an adhesion region in contact with the tubular member and an air vent facing the through hole. The convex part which has an area | region and protrudes rather than the plane containing the said ventilation area | region is formed in the said tubular member, The said ventilation film | membrane has a shape along the part or all of the said convex part in an adhesion area | region.

In the ventilation plug, it is preferable that, among the straight lines extending from the center of the ventilation zone toward the welding zone, the existence range of the one blocked by the convex portion is 180 degrees or more among the 360 degrees around the welding zone.

In the ventilation plug, it is preferable that the outer circumferential portion of the welding region is in contact with the side surface portion of the tubular member.

In the ventilation plug, the tubular member preferably includes two or more of the convex portions.

In the ventilation plug, it is preferable that the height of the convex portion is discontinuous with respect to the circumferential direction of the welding region.

In the ventilation plug, an aspect in which the outer peripheral portion of the welding region extends outward from the top portion of the convex portion is encouraged.

In the ventilation plug, an aspect in which the stepped portion is formed inward from the top portion of the convex portion in the welding region is encouraged.

In the ventilation plug, an aspect in which the flat portion is provided on the inner circumference of the welding region, and the flat portion and the ventilation region are included in the same plane is encouraged.

In the said ventilation stopper, it is preferable to comprise the said ventilation film with the fluororesin.

In the ventilation plug, it is preferable that the fluororesin is porous polytetrafluoroethylene.

In the ventilation plug, the ventilation membrane preferably has liquid repellency.

In the ventilation plug of the present invention, since the ventilation membrane is mounted to cover the convex portion of the cylindrical member, clogging of the liquid by the convex portion is reduced, and the liquid is smoothly discharged to the outside of the ventilation plug. That is, since the liquid easily moves on the ventilation membrane, the liquid hardly stays in the ventilation stopper, and high breathability can be maintained even in a harsh use environment such as outdoors.

(A) is a perspective view of the ventilation plug according to Embodiment 1 of this invention, (b) is sectional drawing of the ventilation plug.
2 is a partial cross-sectional view of a conventional ventilation plug.
3 is a partial cross-sectional view of the vent cap of the present invention.
(A) is a perspective view of the ventilation plug according to Embodiment 2 of this invention, (b) is sectional drawing of the ventilation plug.
5 is a perspective view of a vent cap according to Embodiment 3 of the present invention.
6 is a perspective view of another ventilation plug according to Embodiment 3 of the present invention.
7 is a perspective view of a vent cap according to Embodiment 4 of the present invention.
8 is a perspective view of a ventilating stopper according to Embodiment 5 of the present invention.
9 is a partial cross-sectional view of the vent cap according to Embodiment 6 of the present invention.
It is sectional drawing of the modification of the ventilation plug of this invention.
11 is a cross-sectional view of another modification of the vent cap of the present invention.
12 (a) to 12 (c) are cross-sectional views showing the manufacturing process of the vent cap of the present invention.
(A) is sectional drawing of the ventilation plug according to the manufacture example 1 of this invention, (b) is a top view of the ventilation plug.
(A) is sectional drawing of the ventilation plug according to the manufacture example 2 of this invention, (b) is a top view of the ventilation plug.
FIG. 15A is a cross-sectional view of the ventilation plug according to Production Example 3 of the present invention, and (b) is a plan view of the ventilation plug.
(A) is sectional drawing of the ventilation plug according to the manufacture example 4 of this invention, (b) is a top view of the ventilation plug.
Fig. 17 (a) is sectional drawing of the ventilation plug according to the manufacture example 5 of this invention, (b) is a top view of the ventilation plug.
(A) is sectional drawing of the ventilation plug according to the manufacture example 6 of this invention, (b) is a top view of the ventilation plug.

1. Structure of aeration plug

EMBODIMENT OF THE INVENTION Hereinafter, the structure of the ventilation plug in embodiment of this invention is demonstrated, referring drawings.

(Embodiment 1)

BRIEF DESCRIPTION OF THE DRAWINGS The ventilating stopper which concerns on Embodiment 1 of this invention is shown, (a) is a perspective view, (b) is sectional drawing of the ventilation membrane provided in the ventilation stopper of the vertical direction. As shown in FIG. 1, the ventilation film 2 is attached to the upper part of the cylindrical member 1 which has the through-hole 1a. The part which contact | connects the cylindrical member 1 in the circumferential form among the ventilation films 2 is called "adherence area | region." In addition, in the part which is not in contact with the cylindrical member 1 and faces the through-hole 1a, ventilation is possible through the through-hole 1a, and this is called "ventilation area".

In the cylindrical member 1, the convex part 1b which protrudes upwards rather than the plane containing the ventilation area | region of the ventilation film 2 (surface shown with a dotted line in FIG. 1 (b)) is formed. Since this convex part 1b becomes a protection bank and the worker's hand etc. are prevented from directly contacting the ventilation membrane 2 at the time of the handling operation of a ventilation plug, etc., the probability of the ventilation membrane 2 being damaged can be reduced. In addition, the convex part 1b may be formed integrally as a part of the cylindrical member 1, and the component added separately to the cylindrical member 1 may be sufficient as it.

The ventilation membrane 2 which concerns on Embodiment 1 of this invention is formed so that the convex part 1b may be covered in an adhesion area | region, and has the shape which follows the surface shape of the convex part 1b. Therefore, the droplet existing in the ventilation region of the ventilation membrane 2 is smoothly moved from the ventilation region to the adhesion region on the ventilation membrane 2 without being blocked by the convex portion 1b. For this reason, since droplets are hard to remain in the ventilation stopper, and the effective opening area of the ventilation membrane 2 is maintained even in a severe use environment such as outdoors or inside the engine room, high ventilation can be maintained.

2 and 3 will be described in detail how the droplet flows. 2 is a partial cross-sectional view of a conventional ventilation plug, wherein the ventilation membrane 2 is fixed inside the tubular member 1, and the ventilation membrane 2 is not formed along the surface of the convex portion 1b. For this reason, the inlet which rises to the convex part 1b of the cylindrical member 1 in the ventilation area | region of the ventilation film 2 is a boundary of a different material. In general, the liquid tends to stay in the capillary portion, so that the liquid tends to stay at the boundary line between the ventilation membrane 2 and the convex portion 1b (the corner of the ventilation membrane 2) in the ventilation plug of FIG.

The droplet 3 staying at the boundary between the ventilation membrane 2 and the convex portion 1b reduces the effective opening area of the ventilation membrane 2. On the other hand, in the ventilation plug of the present invention shown by the partial sectional view of FIG. 3, since the ventilation membrane 2 is continuously formed along the surface shape of the convex part 1b, the ventilation plug may be inclined or vibrated or the like. As a result, the droplets 3 on the ventilation membrane 2 flow out smoothly to the outside.

The details of the constituent material of the ventilation membrane 2 will be described later. However, if the constituent material of the ventilation membrane 2 has a higher water repellent function (or oil repellent function) than the constituent material of the tubular member 1, the ventilation membrane ( 2) The effect that the water or oil in the phase is discharged smoothly is increased. The water-repellent or oil-repellent function of the ventilation membrane 2 is an angle between the tangent of the surface of the droplet 3 and the surface of the ventilation membrane 2 at a portion where the surface of the ventilation membrane 2 and the surface of the droplet 3 contact each other. Can be evaluated by. For example, when the water-repellent / oil-repelling function of the cylindrical member 1 is low, the said angle is large and the flow of the droplet 3 worsens, as shown in FIG. On the other hand, if the water-repellent / oil-repelling function of the ventilation membrane 2 is high, as shown in FIG. 3, the said angle is small, and the droplet 3 is discharged smoothly by rolling on the ventilation membrane 2, and so on.

In the ventilation plug according to Embodiment 1 of the present invention, the outer peripheral portion of the welding region of the ventilation membrane 2 is in contact with the side surface portion of the tubular member 1. This is because the droplets 3 are reliably guided to the side portions of the ventilation plugs. However, even if the ventilation membrane 2 does not reach the side part of the cylindrical member 1, when the ventilation membrane 2 is formed so that the at least part of the convex part 1b may be covered, the convex part 1b Flow obstruction is improved.

As shown in FIG. 1, when two convex parts 1b of the cylindrical member 1 are formed (or three or more), the presence of the plurality of convex parts 1b may cause the air vent plug to be handled during handling. The breakage of the air permeable membrane 2 can be prevented more reliably. In addition, when the number of the convex parts 1b formed increases, the shape of the cylindrical member 1 becomes complicated, and the fixing effect of the cylindrical member 1 and the ventilation film 2 is improved. That is, the height of the convex part 1b should just be discontinuous with respect to the circumferential direction of the welding area | region of the ventilation membrane 2. In addition, a gap can be provided between one convex portion 1b and another adjacent convex portion 1b due to the presence of the plurality of convex portions 1b. By such a gap, the droplet 3 is discharged more smoothly.

However, it is necessary to avoid widening the gap between the convex portions 1b and the other convex portions 1b adjacent to each other. The gap between the convex portion 1b and the convex portion 1b is significant, and even if the gap is widened, the droplet ejection effect does not change much. On the other hand, if the gap is too wide, the original object of the convex portion 1b in the present invention, which prevents the convex portion 1b from being directly in contact with the ventilating membrane 2 with the protection dam, is not achieved. Because it is not.

Therefore, in the ventilation plug of this embodiment, it is preferable that the range of existence of the thing interrupted by the convex part 1b among the straight lines extended from the center of the ventilation area toward the welding area is at least 180 degrees in the surrounding 360 degrees of the welding area. desirable.

More specifically, it demonstrates using FIG. 16 mentioned later. As shown in FIG. 16 (b), in the straight line extending from the center of the ventilation region to the welding region, the existence range of the one blocked by the convex portion 1b (dashed line arrow) is in the surrounding 360 degrees of the welding region. It is preferable to set it as 180 degrees or more (preferably 210 degrees or more, More preferably, 240 degrees or more). In other words, the total range of the existence of the straight line (solid arrow) not blocked by the convex portion 1b, that is, the angle α, is less than 180 degrees (preferably less than 150 degrees, more preferably less than 120 degrees). It is desirable to. In addition, although the case where the ventilation area | region is a cause was demonstrated as an example here, when the ventilation area | region is not a circle, the center of gravity of the ventilation area | region is taken as the center of the ventilation area | region.

As described above, in the present invention, when the convex portion 1b is present in the welding region, the straight line is cut off, and when the convex portion 1b is not present, the straight line is not cut off. It is also possible to further narrow the definition of ". For example, as shown in Fig. 16 (a), a region in which the elevation angle β of the convex portion 1b viewed from the center of the circle is 15 degrees or more (more preferably, 30 degrees or more) is referred to as the "center of the ventilation region." By defining a region in which a straight line extending toward the welding region is blocked by the convex portion 1 ", a ventilation plug having a higher protection function of the convex portion 1b with respect to the hand and the finger can be obtained. On the other hand, the upper limit of the elevation angle β is not particularly limited, but is, for example, 60 degrees or less or 45 degrees or less.

Of course, even if the convex portion 1b is formed around the entirety of the cylindrical member 1, as long as the ventilation membrane 2 is formed so as to cover at least a part of the convex portion 1b, the ventilation plug of the present invention is a droplet. (3) can be discharged efficiently.

The ventilation plug according to Embodiment 1 of the present invention is used for a storage case of an electric device that requires both ventilation and spinning. A circular hole is drilled in the storage case, for example, and a vent plug is attached to the hole. As shown in FIG. 1, when the cylindrical member 1 of a ventilation stopper is made into a taper shape, a ventilation stopper can be reliably fitted in a hole.

(Embodiment 2)

4: shows the ventilation plug which concerns on Embodiment 2 of this invention, (a) is a perspective view, (b) is sectional drawing of the ventilation membrane provided in the ventilation plug in the vertical direction. The ventilation plug according to the second embodiment basically has the same configuration as the ventilation plug according to the first embodiment, but as shown in FIG. 4, the convex portion 1b of the ventilation plug according to the second embodiment has a corner portion. It is composed of smooth, curved surfaces. Since the surface of the convex part 1b is smooth, the droplet flows more smoothly. Preferably, the radius of curvature of the surface of the convex portion 1b is preferably 0.5 mm or more. On the other hand, while repeating the handling of the ventilation plug, the conspicuous dirt adheres to the corners of the projections 1b intensively, and the product value of the ventilation plugs decreases, but the surface of the projections 1b is smooth. If it's a shape, the attached dirt is inconspicuous. In addition, the phenomenon that the corner of the filter is rubbed can be avoided, and the filter protection is also improved.

(Embodiment 3)

After Embodiment 3, another modification of the ventilation plug of this invention is demonstrated. 5 is a perspective view of a vent cap according to Embodiment 3 of the present invention. As for the ventilation plug according to Embodiment 3, the convex part 1b is formed in three places. Since there are three convex portions 1b, there are also three gaps existing between the convex portions 1b and the other convex portions 1b, and droplets remaining inside the ventilation plugs are easily discharged to the outside. In the ventilation plug according to Embodiment 3, the outer periphery of the welding region of the ventilation membrane 2 does not reach the side surface of the tubular member 1 because the ventilation membrane 2 is slightly smaller. It's enough to guide it smoothly to the top.

6 is a perspective view of another ventilation plug according to Embodiment 3 of the present invention. The ventilation plug shown in FIG. 6 is an aspect in which the outer periphery of the welding region of the ventilation membrane 2 extends outward from the top of the convex portion 1b, and the effect of reliably discharging the droplet to the outside of the ventilation plug is ensured. have.

5 and 6, the convex portion 1b has a trapezoidal cross-sectional shape in the circumferential direction. By making the cross-sectional shape trapezoidal, slopes are formed on the inside and the outside of the air vent stopper, and the droplets can be discharged more smoothly.

(Embodiment 4)

7 is a perspective view of a vent cap according to Embodiment 4 of the present invention. The shape of the convex part 1b of the ventilation plug which concerns on Embodiment 4 is spherical shape. The ventilation plug according to the present embodiment has a structure in which liquid does not easily stay inside because the surface shape of the projection 1b is gentle while preventing the breakage of the ventilation membrane by the projection 1b of the ventilation plug. To provide.

(Embodiment 5)

8 is a perspective view of a ventilating stopper according to Embodiment 5 of the present invention. In the ventilation plug according to Embodiment 5, since the ventilation membrane 2 also covers the side surface of the tubular member 1, the droplets are discharged very smoothly from the inside of the ventilation plug to the outside. In addition, since the contact area between the ventilation membrane 2 and the tubular member 1 is very large, the ventilation membrane 2 is difficult to peel off from the tubular member 1, and the period of the contents of the ventilation plug is greatly increased.

Embodiment 6

9 is a partial cross-sectional view of the ventilation plug according to Embodiment 6 of the present invention, in which the convex portion 1b is particularly enlarged. The ventilation plug according to Embodiment 6 is an embodiment in which the stepped portion 1c is formed inside the top portion of the convex portion 1b in the welding region of the ventilation membrane 2. In the present invention, the stepped portion refers to a portion where the inclination angle of the surface of the convex portion 1b is locally small. The small angle of inclination means that the angle formed between the slope of the convex portion 1b and the plane including the ventilation region of the ventilation membrane 2 is small.

In the ventilation membrane 2 of the present invention, fine ventilation holes for allowing gas to permeate are formed. At the interface between the tubular member 1 and the ventilation membrane 2, the tubular member 1 and the ventilation membrane (by the anchor effect of a part of the tubular member 1 entering the ventilation hole of the ventilation membrane 2) Fixing force with 2) becomes stronger. By the way, in the slope part of the convex part 1b, the structure of the micro vent hole of the ventilation membrane 2 is deformed by the pressure at the time of shaping | molding, and since the micro vent hole is relatively small, the tubular member 1 is a ventilation membrane 2 It is difficult to enter into the vent hole of, and the fixing force of the tubular member 1 and the vent film 2 becomes weak.

In the ventilation plug according to Embodiment 6 of the present invention, the inclined angle of the surface of the convex portion 1b is formed locally, that is, by forming the stepped portion 1c on the slope, thereby communicating with the cylindrical member 1. The fall of the adhesion with the base film 2 can be alleviated locally.

Even if the stepped portion 1c is present, a large differential pressure is temporarily applied from the lower side of the ventilation region as shown in FIG. 9, and the ventilation membrane 2 is wound up along the slope of the convex portion 1b. The stepped portion 1c exerts a peeling stop function, thereby making it possible to avoid complete detachment of the ventilation membrane 2.

2. Detailed description of each component of aeration plug

As mentioned above, although the structure of the ventilation plug of this invention was demonstrated by Embodiment 1-Embodiment 6, the detail (preferable material etc.) of the tubular member 1 and the ventilation membrane 2 is demonstrated below.

(1) cylindrical member

It is preferable that the cylindrical member 1 is comprised from elastic resin, considering the use which fits a ventilation plug into a part of electric device as mentioned above. Examples of the resin include elastic resins mainly composed of olefins such as suntoprene and elastomeric rubber, ethylene propylene rubber (EPDM), acrylic rubber, silicone rubber, fluorine rubber or other rubber-based elastic resins, and polypropylene (PP). It is preferable to include. In order to easily insert the ventilation plug of the present invention into a part of the electric device, the hardness (JIS K 6253) of the cylindrical member 1 is 100 degrees or less, more preferably 80 degrees or less. In order to ensure the sealing property of a cylindrical member, it is 10 degrees or more, More preferably, it is 40 degrees or more. A durometer (manufactured by Shimadzu Corporation): DUROMETER A is used for the measurement of the rubber hardness.

As for the height of the convex part 1b of the cylindrical member 1, 5 to 200% is preferable with respect to the diameter of the through-hole 1a, More preferably, it is 10 to 100%, More preferably, it is 15 to 50%. It is desirable to.

(2) ventilation membrane

Polyethylene, polypropylene, polystyrene, polyimide, and the like can be used as the constituent material of the air-permeable membrane 2, but preferably a fluororesin excellent in waterproofing properties, more preferably of porous polytetrafluoroethylene (porous PTFE) Use of film is encouraged. As the microscopic shape of the air permeable membrane 2, a net type, a mesh type, or a porous type can be used. Porous PTFE film is excellent in spinning property and is suitable for the use which makes air permeability inside and outside an electric device, while preventing the ingress of water droplets, oil droplets, and dust.

A porous PTFE film is obtained by extending | stretching at high temperature and high speed, and baking as needed, after removing a shaping | molding adjuvant from the molded object of the paste obtained by mixing fine powder of PTFE with a shaping | molding adjuvant. In the case of uniaxial stretching, the nodes (folding crystals) have an island shape perpendicular to the stretching direction, and the fibrills (straight-type molecular bundles in which the folding crystals are pulled out and drawn out by stretching) are connected to the nodes so as to connect the nodes. ) Is oriented in the stretching direction. In addition, the space separated between the fibrils or the fibrils and the nodes has a hollow fiber structure. In the case of biaxial stretching, the fibrils are radially spread, and the nodes connecting the fibrils are dotted with islands to form a cobweb-like fibrous structure in which a large number of spaces separated by the fibrils and the nodes exist.

The ventilation membrane 2 may be a uniaxially stretched porous PTFE film or a biaxially stretched porous PTFE film.

The ventilation membrane 2 preferably has strength enough to be used alone (single layer), but it has elasticity, such as a net such as a nonwoven fabric, a woven fabric or a knitted fabric, and preferably can withstand high temperatures of 120 ° C. It may be used in combination with a breathable reinforcing layer.

The physical characteristics of the ventilation membrane 2 include a water pressure of 1 kPa or more, more preferably 10 kPa or more, and an air permeability (JIS P 8117) of 1000 seconds or less, more preferably 100 seconds or less. It is preferable.

It is preferable that the air permeable membrane 2 is provided with liquid repellency to the pore inner surface. By making the air permeable membrane 2 have liquid repellency, various contaminants such as retention fluid, machine oil, and water droplets can be suppressed from infiltrating or retained in the pores of the air permeable membrane. These contaminants lower the collection characteristics and the ventilation characteristics of the ventilation membrane, which causes the function of the ventilation membrane to be impaired. Moreover, you may provide liquid repellency to the whole surface of the cylindrical member 1.

In the claims and the present specification, as the method of imparting liquid repellency, a liquid repellent material may be used or a liquid repellent may be added. In this case, "liquid repellent" means a property or function of splashing liquid. It is assumed that "water repellent" includes "water repellent", "oil repellent", "water repellent" and the like. Hereinafter, the water / oil repellent polymer will be described as an example.

As the water / oil repellent polymer, a polymer having a fluorine-containing side chain can be used. Details of the water / oil repellent polymer and a method of compounding the same in a porous PTFE film are disclosed in WO94 / 22928 and the like, and one example thereof is shown below.

As the water / oil repellent polymer, a fluoroalkyl acrylate and / or fluoroalkyl methacrylate represented by the following general formula (1) (wherein n is an integer of 3 to 13 and R is hydrogen or a methyl group) is polymerized. A polymer having a fluorine-containing side chain obtained (preferably an alkyl fluoride portion having 4 to 16 carbon atoms) can be preferably used. In order to coat the pores of the porous PTFE film using this polymer, an aqueous microemulsion (average particle diameter of 0.01 to 0.5 µm) of the polymer was prepared using a fluorine-containing surfactant (eg, ammonium perfluorooctanate). It is made to impregnate this in the pores of the porous PTFE film and then heated. This heating removes the water and the fluorine-containing surfactant, melts the polymer having the fluorine-containing side chain, and coats the surface of the pores of the porous PTFE film while maintaining continuous pores, thereby providing excellent air permeability and oil repellency. You can get a film.

(3) other

For joining the tubular member 1 and the vent film 2, a method of pressing the vent film 2 onto the molten tubular member 1 can be used as described below. A double-sided adhesive tape may be used. It is not an essential component of the invention. The double-sided adhesive tape includes a nonwoven fabric-based double-sided adhesive tape based on a polyethylene nonwoven fabric, a polypropylene nonwoven fabric, a nylon nonwoven fabric, a PET-based double-sided adhesive tape, a polyimide-based double-sided adhesive tape, a nylon-based double-sided adhesive tape, and a foam (e.g., urethane). Foams, silicone foams, acrylic foams, polyethylene foams) Various types of face adhesive tapes can be used, such as a base double-sided adhesive tape and a baseless double-sided adhesive tape.

3. Variation of Aeration Plug

The ventilation plug of the present invention is attached, for example, directly or indirectly to a case (housing) for storing an electronic component therein. The shape of the cylindrical member 1 can be changed in various ways depending on the shape of the attachment site.

As shown in FIG. 10, when the ventilation plug is attached to the front end of the ventilation pipe 5, the shape of the cylindrical member 1 is formed so as to fit both inside and outside of the ventilation pipe 5. Therefore, the adhesion strength of the vent plug becomes high.

As shown in FIG. 11, when the ventilation plug is attached to the bottomed hole formed in a part of the case (body) 6, the tubular member 1 is made into a deep dish shape, so that the ventilation plug 1 Since the synthesis is good, it is possible to produce a ventilation plug having good shielding property and excellent adhesion strength.

4. Manufacturing process of aeration plug

Hereinafter, the process example applicable to manufacture of the ventilation plug of this invention is demonstrated.

(1) Injection molding (injection molding)

The molten thermoplastic resin is press-fitted into a mold processed into a predetermined concave shape, and then the thermoplastic resin is cooled to obtain a molded product of the vent cap. The process sequence is shown in process sectional drawing of FIG.12 (a)-(c).

First, as shown in Fig. 12A, the first mold 11 and the second mold 12 face each other and are in close contact with each other to form a cavity having a cylindrical member 1 shape inside the mold. . The ventilation membrane 2 is previously sandwiched between the first mold 11 and the second mold 12.

Subsequently, as shown in FIG. 12B, the thermoplastic resin melted from the injection port 13 is injected into the first mold 11. When the thermoplastic resin reaches the ventilation membrane 2, the thermoplastic resin pushes the ventilation membrane 2 down to the bottom of the second mold 12, so that the ventilation membrane 2 is molded into a shape corresponding to the thermoplastic resin shape. . At this time, the resin is impregnated into the void portion of the air-permeable membrane 2 (for example, PTFE porous body) by the injection pressure of the resin, and the resin is cooled and cured so that the resin (that is, the molded cylindrical member 1) The air permeable membrane 2 is firmly fixed by the anchor effect.

Finally, as shown in FIG.12 (c), by demolding the 1st metal mold | die 11 and the 2nd metal mold | die 12, the ventilation plug in which the cylindrical member 1 and the ventilation membrane 2 were integrally formed was opened. You can get it.

(2) compression molding (compression molding)

The procedure is the same as the injection molding described above, but in compression molding, the resin (rubber-based material such as EPDM) cured by vulcanization is pressed into a mold processed into a predetermined shape by a high-pressure press, and Then, it is a method of obtaining the molded article of a ventilation plug by hardening resin by vulcanization. By the injection pressure of the resin, a tight fixing effect due to the anchor effect can be obtained by impregnating the resin in the void portion of the ventilation membrane 2 (for example, a PTFE porous body) and cooling and curing the resin.

(3) other methods

By the molding process such as injection molding or compression molding, first, the cylindrical member 1 is molded alone, and then the ventilation membrane 2 is formed by using a welding member having a predetermined shape in the welding region of the cylindrical member 1. It is also possible to adhere to. In fixing, the tubular member 1 is again melted, the molten resin is impregnated into the void portion of the vent film 2 (for example, a PTFE porous body), and the tubular member 1 is cooled and solidified to fix the tubular member 1. ) And a ventilation plug in which the ventilation membrane 2 is formed integrally.

In addition, the cylindrical cylindrical member 1 and the ventilation membrane 2 made of resin can be adhered with an adhesive, and as described above in detail, they can be fixed with a double-sided tape.

5. Production Example

In addition to the above-described first to sixth embodiments, the vent plugs of various shapes are produced, and therefore these structures will also be described below.

(Production Example 1)

Fig. 13 shows a ventilation plug (formerly known ventilation plug) according to Production Example 1, (a) is a sectional view in the vertical direction of the ventilation membrane 2 provided with the ventilation plug, and (b) is a plan view of the ventilation plug. . As shown in FIG. 13, although the convex part 1b is formed in the ventilation stopper, the ventilation membrane is not formed along this convex part 1b. That is, the ventilation membrane 2 does not have the adhesion region prescribed | regulated by this invention.

(Production Example 2)

Fig. 14 shows a ventilation plug according to Production Example 2, (a) is a sectional view in the vertical direction of the ventilation membrane 2 provided in the ventilation plug, and (b) is a plan view of the ventilation plug. As shown in FIG. 14, the ventilation film 2 has the shape which follows a part of convex part 1b.

(Production Example 3)

Fig. 15 shows a ventilation plug according to Production Example 3, (a) is a sectional view in the vertical direction of the ventilation membrane 2 provided in the ventilation plug, and (b) is a plan view of the ventilation plug. As shown in FIG. 15, the ventilation film 2 has the shape which the outer peripheral part of a welding region contact | connects the side part of a cylindrical member along the convex part 1b.

(Production Example 4)

FIG. 16: shows the ventilation stopper which concerns on the manufacture example 4, (a) is sectional drawing of the ventilation membrane 2 provided in the ventilation stopper in the vertical direction, (b) is a top view of the ventilation stopper. As shown in FIG. 16, three convex parts 1b are formed in the cylindrical member 1 independently.

(Production Example 5)

Fig. 17 shows a ventilation plug according to Production Example 5, (a) is a sectional view in the vertical direction of the ventilation membrane 2 provided in the ventilation plug, and (b) is a plan view of the ventilation plug. As shown in FIG. 17, three convex parts are formed in the cylindrical member 1, and the outer periphery of the welding area | region of the ventilation membrane 2 extends outward from the top part of the convex part 1b, and is formed. .

(Production Example 6)

Fig. 18 shows a ventilation plug according to Production Example 6, (a) is a sectional view in the vertical direction of the ventilation membrane 2 provided in the ventilation plug, and (b) is a plan view of the ventilation plug. As shown in FIG. 18, the ventilation plug according to Production Example 6 basically has the same configuration as the ventilation plug according to Production Example 5, but in the ventilation plug according to Production Example 6, the adhesion region of the ventilation membrane 2 is shown. The flat part 1d is provided in the inner peripheral part of the structure, and the flat part 1d and the ventilation area are comprised so that it may be contained in the same plane. That is, since there is no incline incline from the ventilation region to the inner circumference of the welding region and becomes a barrier free state, the droplets from the ventilation region can be discharged more smoothly.

In any of the Production Examples 1 to 6, a mold was made using a rubber compression molding machine (manufactured by Meiki Seisakusho Co., Ltd .: R series, clamping capacity of 70 ton) and a metal mold having a cavity having a predetermined shape. After providing the ventilation membrane at the predetermined position of, the unvulcanized rubber was pressed into the mold to vulcanize and harden to obtain a ventilation plug. On the other hand, EPDM was used for resin which comprises the cylindrical member 1, and the oil repellent PTFE film (1 micrometer of pore diameters, 300 micrometers in thickness, 60% of porosity (all nominal values)) was used for the ventilation film 2.

6. Test Example

In the said production example, using manufacture example 1 (conventional example), manufacture example 3, manufacture example 4, and manufacture example 6, 2 drops (about 0.4 g) of water was dripped at the ventilation zone of a ventilation membrane, and a ventilation zone was By tilting the ventilation plug gradually in a horizontal state, the angle of the ventilation plug when the water droplets fell from the ventilation plug was confirmed. The results were as shown in Table 1.

Production example Production Example 1 Production Example 3 Production Example 4 Production Example 6 Tilt angle of aeration plug (degrees)
(When a drop falls) 91.3 67.7 46.7 32.3

From Table 1, the following considerations are possible. In Production Example 1 (conventional example), the ventilation plug was inclined at 91.3 degrees and only water droplets were discharged. In Production Example 3, the ventilation membrane had a shape along the convex portion, and water droplets were discharged when the ventilation plug was inclined at 67.7 degrees. In Production Example 3, it is considered that the flow of water droplets is smoothed due to the presence of the air permeable membrane formed along the convex portion. In Production Example 4, three convex portions were formed independently on the tubular member, and the water droplets flowed smoothly between the convex portions and the convex portions, and the droplets were discharged only by tilting the ventilation plug only 46.7 degrees.

Furthermore, in Production Example 6, as described above, since the barrier-free state extends from the ventilation region to the inner circumference of the welding region, it is possible to discharge the droplets from the ventilation region to the welding region more smoothly. The water droplets were discharged only by tilting.

1: cylindrical member 1a: through hole
1b: convex portion 1c: stepped portion
1d: flat part 2: ventilation membrane
3: droplet 5: aeration pipe
6: case (housing) 11: first mold
12: second mold 13: injection hole

Claims (11)

A tubular member having a through hole and a vent film adhered to the tubular member, wherein the vent film has an adhered region contacting the tubular member and a vent region facing the through hole, and the vent member includes the vent region. A convex portion protruding from the plane is formed, and the ventilation membrane has a shape along a part or all of the convex portion in the welding region. The ventilation plug according to claim 1, wherein an extent of existence of the straight lines extending from the center of the ventilation region toward the welding region is at least 180 degrees among 360 degrees of the welding region. The ventilation plug according to claim 1 or 2, wherein an outer circumferential portion of the welding region is in contact with a side portion of the tubular member. The ventilation plug according to any one of claims 1 to 3, wherein the tubular member includes two or more of the convex portions. The ventilation plug according to any one of claims 1 to 4, wherein the height of the convex portion is discontinuous with respect to the circumferential direction of the welding region. The ventilation plug according to any one of claims 1 to 5, wherein an outer circumferential portion of the welding region extends outward from a top portion of the convex portion. The ventilation plug according to any one of claims 1 to 6, wherein a stepped portion is formed in the welding region inward from a top portion of the convex portion. The ventilation plug according to any one of claims 1 to 7, which has a flat portion at an inner circumference of the welding region, and the flat portion and the ventilation region are included in the same plane. The ventilation plug according to any one of claims 1 to 8, wherein the ventilation membrane is made of a fluororesin. 10. The vent cap according to claim 9, wherein the fluorine resin is porous polytetrafluoroethylene. The ventilation plug according to any one of claims 1 to 10, wherein the ventilation membrane has liquid repellency.

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